Could not Load File Or Assembly Telerik.Licensing.Runtime, Version 1.4.6.0 Runtime Error

Environment

Product Version	2025.1.211
Product	UI for WPF

Description

FileNotFoundException is thrown at runtime, which states that the Telerik.Licensing.Runtime assembly cannot be loaded. The error message is something like this:

FileNotFoundException: Could not load file or assembly 'Telerik.Licensing.Runtime, Version=1.4.6.0, Culture=neutral, PublicKeyToken=tokenhere'. The system cannot find the file specified.

This may happen if you upgrade to 2025 Q1 from an older version. With 2025 Q1, a new licensing mechanism was introduced, which requires you to reference the Telerik.Licensing.Runtime dll.

Solution

The exception means that the version of the Telerik.Licensing.Runtime dll mismatches the version of the version expected by the other Telerik UI for WPF dlls. This may happen if the project references the Telerik dlls containing the component/controls from one version and the Telerik.Licensing.Runtime dll from another version of Telerik UI for WPF.

To resolve the problem, make sure that all Telerik controls are referenced from the same installation place, thus using the same release version.